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WO2008129391A1 - Train de vilebrequin intégré destiné à des moteurs à combustion interne et des compresseurs - Google Patents

Train de vilebrequin intégré destiné à des moteurs à combustion interne et des compresseurs Download PDF

Info

Publication number
WO2008129391A1
WO2008129391A1 PCT/IB2008/000938 IB2008000938W WO2008129391A1 WO 2008129391 A1 WO2008129391 A1 WO 2008129391A1 IB 2008000938 W IB2008000938 W IB 2008000938W WO 2008129391 A1 WO2008129391 A1 WO 2008129391A1
Authority
WO
WIPO (PCT)
Prior art keywords
piston
connecting rod
swivel
crankshaft drive
drive according
Prior art date
Application number
PCT/IB2008/000938
Other languages
English (en)
Other versions
WO2008129391A8 (fr
Inventor
Luis Antonio Fonseca Galli
Original Assignee
Thyssenkrupp Metalúrgica
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Thyssenkrupp Metalúrgica filed Critical Thyssenkrupp Metalúrgica
Priority to PL08762687T priority Critical patent/PL2134991T3/pl
Priority to EP08762687A priority patent/EP2134991B1/fr
Priority to ES08762687T priority patent/ES2419105T3/es
Publication of WO2008129391A1 publication Critical patent/WO2008129391A1/fr
Publication of WO2008129391A8 publication Critical patent/WO2008129391A8/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J1/00—Pistons; Trunk pistons; Plungers
    • F16J1/10—Connection to driving members
    • F16J1/14—Connection to driving members with connecting-rods, i.e. pivotal connections
    • F16J1/20—Connection to driving members with connecting-rods, i.e. pivotal connections with rolling contact, other than in ball or roller bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C7/00—Connecting-rods or like links pivoted at both ends; Construction of connecting-rod heads
    • F16C7/02—Constructions of connecting-rods with constant length
    • F16C7/023—Constructions of connecting-rods with constant length for piston engines, pumps or the like
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J7/00—Piston-rods

Definitions

  • the invention relates to a crankshaft drive, more preferably for internal combustion engines and compressors, with connecting rod and piston.
  • the connecting rod has a small end bearing which is connected to the piston through a piston pin (EP 1 507 088 Al) .
  • the piston pin is fixed in position through a locking ring.
  • the assembling of the parts is expensive and its automation is very complex.
  • the piston pin is an important component, responsible for transmission of forces, and must have an adequate cross section area.
  • the small end bearing and more preferably the piston pin increase the inertia! mass of the arrangement consisting of connecting rod and piston which, during operation of the crankshaft drive in the power stroke, are accelerated and decelerated in cycles.
  • the invention is based on the technical problem of reducing the inertia! mass of the arrangement consisting of connecting rod and piston.
  • a connection between connecting rod and piston is to be created which is easy to assemble.
  • the problem is solved with the connecting rod being linked with the piston by means of positive locking without a piston pin.
  • the connecting rod and the piston have integrated positive locking elements engaged with each other, preferably arranged in the main load direction of the connecting rod without offset relative to the longitudinal extent of the connecting rod and are molded onto the connecting rod and piston respectively in one piece in accordance with a particularly preferred embodiment of the invention.
  • the longitudinal extension of the swivel head can be different from its shell.
  • the positive locking between connecting rod and piston simplifies the assembly. Through the omission of the piston pin which is usual in the prior art and through the omission of assigned connection surfaces on the piston which are necessary to accommodate the piston pin the mass of the arrangement consisting of connecting rod and piston can be clearly reduced. Therefore there is a down sizing of the system, with the piston pin elimination according to the invention.
  • the connecting rod as positive locking element has a swivel head on the piston-facing end with an external circumferential curve contour.
  • the piston features a swivel shell assigned to the connecting rod with a guide surface contacting the curve contour.
  • the swivel shell is open towards the back of the piston.
  • connection between piston and connecting rod can be designed as ball joint.
  • the curve contour of the swivel head and the guide surface of the swivel shell assigned to the curve contour are formed by cylinder segment surfaces which extend over an angle of more than 180 degrees.
  • the cylindrical surfaces of the swivel head and the swivel shell which are in contact with one another preferably extend over an angle between 200 and 300 degrees.
  • the swivel shell completely encloses the curve contour of the swivel head.
  • the swivel head is joined by a neck with the contour recessed to the extent that the piston and the connecting rod can perform swivel movements relative to each other.
  • the necessary swivel angle is determined by the dimensions of the connecting rod and the eccentric movement performed by the connecting rod in operation.
  • the swivel shell can be arranged in the interior of the piston. With such an arrangement the skirt of the piston receives at least one recess through which the piston head can be inserted into the swivel shell.
  • the invention contemplates that the swivel head of the connecting rod on the piston-facing end and/or the swivel shell of the piston, at least on their surfaces which are in contact, have a wear-resistant and/or friction-reducing bearing surface or coating.
  • the coating for example of hard materials to improve the wear resistance or of a friction-reducing non-metal alloy - can be applied to the outer surface of the swivel head with conventional coating methods, electroplating methods and such like.
  • the bearing surface can consist of a thin inlay which is pressed into the swivel shell of the piston. For example copper or bronze alloys are possible as material for the bearing surface.
  • small cavities can be assigned to the swivel head of the connecting rod and/or to the swivel head of the piston in order to capture oil during operation and consequently reducing the friction losses and wear in this swivel joint.
  • the connecting rod can be designed as a forged, sintered or cast part. Forged components are characterized by favorable strength/weight ratio. Carbon steels such as C70 steels, heat-treatable steels as well as micro-alloyed steels are possible as materials.
  • the connecting rod big end can be designed in two parts and contain a bearing shell.
  • Fig. 1 an arrangement of connecting rod and piston for a crankshaft drive
  • FIG. 2 the connecting rod of the arrangement shown in Fig. 1 ,
  • Fig. 3 the piston of the arrangement shown in Fig. 1.
  • a connecting rod 1 and a piston 2 of a crankshaft drive are shown.
  • the connecting rod 1 is linked with the piston 2 by means of positive locking without a piston pin.
  • the connecting rod 1 and the piston 2 have positive locking elements 3, 4 engaged with each other, which are arranged without offset relative to the longitudinal extension of the connecting rod 1 in the main load direction of the connecting rod 1.
  • the locking elements 3, 4 are molded to the connecting rod 1 and the piston 2 respectively as one piece. Such connections are referred to as "positive lockings" or "form-fittings”.
  • the connecting rod 1 as positive locking element 3 has a swivel head on the piston end with an external circumferential curve contour 5 (see Fig. 2).
  • the positive locking element 4 of the piston 2 consists of a swivel shell which is open towards the piston back and which has a guide surface 6 (see Fig. 3), which is in contact with the curve contour 5 of the swivel head 3.
  • the curve contour 5 of the swivel head 3 and the guide surface 6 of the swivel shell 4 assigned to the swivel head are designed as cylinder segment surfaces which extend over an angle ⁇ of more than 180 degrees.
  • the swivel shell 4 encloses the curve contour 5 of the swivel head 3 completely. From a comparative consideration of Fig.
  • a neck 7 follows the swivel head 3, the contour of which is recessed to the extent that the piston 2 and the connecting rod 1 are able to perform swivel movements relative to each other.
  • the required swivel angle is determined by the dimensions of the connecting rod 1 and the eccentric movements of the connecting rod during the operation of the crankshaft drive.
  • the swivel shell 4 is arranged in the interior of the piston 2 and that the skirt 8 of the piston contains recesses or openings 9 through which the swivel head 3 can be inserted into the swivel shell 4.
  • the recesses 9 enable further reductions of the piston inertial mass.
  • the piston skirt 8 has two recesses 9 which are symmetrically arranged on opposite skirt sections.
  • the connecting rod 1 can be designed as a forged part, sintered part or cast part. It has a divided connecting rod big end 10 in which a bearing shell 11 is inserted.
  • the connecting rod 1 has an H-shaped cross sectional profile between the connecting rod big end 10 and the swivel head 3. It is important to emphasize that the invention works also with different cross sectional profiles between connecting rod big end 10 and the swivel head 3.
  • the swivel head 3 of the connecting rod 1 or the assigned swivel shell 4 of the piston can have a friction-reducing coating, e.g. a non-ferrous metal alloy based on copper or bronze.
  • the invention promotes a reduction of piston assembling mass and takt time due to the removal of a component (piston pin). This results also in a decrease of production cost, with less fixing and assembling devices, storage space and logistics expenses. Furthermore, the machining of both components is more simple, promoting a potential reduction in machining tools wear off.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Compressor (AREA)

Abstract

L'invention concerne un entraînement par manivelle, destiné de préférence à des moteurs à combustion interne et des compresseurs ayant une bielle et un piston. La bielle est reliée au piston à l'aide d'un blocage positif sans axe de piston.
PCT/IB2008/000938 2007-04-19 2008-04-17 Train de vilebrequin intégré destiné à des moteurs à combustion interne et des compresseurs WO2008129391A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
PL08762687T PL2134991T3 (pl) 2007-04-19 2008-04-17 Bezsworzniowy wał korbowy dla silników spalinowych i sprężarek
EP08762687A EP2134991B1 (fr) 2007-04-19 2008-04-17 Train de vilebrequin intégré destiné à des moteurs à combustion interne et des compresseurs
ES08762687T ES2419105T3 (es) 2007-04-19 2008-04-17 Transmisión de manivela sin pasador para motores de combustión interna y compresores

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE102007018435A DE102007018435A1 (de) 2007-04-19 2007-04-19 Kurbeltrieb, insbesondere für Verbrennungskraftmaschinen und Kompressoren
DE102007018435.4 2007-04-19
EP07014184A EP1983232A1 (fr) 2007-04-19 2007-07-19 Vilebrequin sans piston pour moteurs à combustion interne et compresseurs
EP07014184.1 2007-07-19

Publications (2)

Publication Number Publication Date
WO2008129391A1 true WO2008129391A1 (fr) 2008-10-30
WO2008129391A8 WO2008129391A8 (fr) 2009-12-17

Family

ID=39637626

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2008/000938 WO2008129391A1 (fr) 2007-04-19 2008-04-17 Train de vilebrequin intégré destiné à des moteurs à combustion interne et des compresseurs

Country Status (5)

Country Link
EP (2) EP1983232A1 (fr)
DE (1) DE102007018435A1 (fr)
ES (1) ES2419105T3 (fr)
PL (1) PL2134991T3 (fr)
WO (1) WO2008129391A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2478999B (en) * 2010-03-26 2012-02-15 Daniel James Chidley An interlocking assembly comprising a pinless piston and connecting rod
US9103441B2 (en) * 2012-01-09 2015-08-11 Federal-Mogul Corporation Piston pin for heat dissipation
EP2647887B1 (fr) 2012-04-05 2017-01-18 ThyssenKrupp Metalúrgica Campo Limpo Ltda. Piston à structure active
EP3330577A1 (fr) 2016-11-30 2018-06-06 ThyssenKrupp Metalúrgica Campo Limpo Ltda. Piston - ensemble bielle

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1497274A (fr) * 1966-10-21 1967-10-06 Danfoss As Assemblage de transmission entre le piston et la bielle d'un moteur à piston
DE3504410A1 (de) * 1985-02-08 1986-10-16 Odilo 7000 Stuttgart Schwaiger Pleuelstange fuer hubkolbenmotoren
JPS6365180A (ja) * 1986-09-05 1988-03-23 Matsushita Refrig Co 密閉型電動圧縮機のピストン装置
WO1998019067A1 (fr) * 1996-10-29 1998-05-07 Zanussi Elettromeccanica S.P.A. Piston pourvu d'une bielle liberable pour compresseurs de refrigeration
EP1507088A1 (fr) 2003-08-13 2005-02-16 Nissan Motor Company, Limited Structure pour relier un piston avec un vilebrequin
EP1538373A1 (fr) 2003-12-02 2005-06-08 MAN B&W Diesel AG Mécanisme d'entraínement de moteur à combustion comprenant un piston et une bielle

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1497274A (fr) * 1966-10-21 1967-10-06 Danfoss As Assemblage de transmission entre le piston et la bielle d'un moteur à piston
DE3504410A1 (de) * 1985-02-08 1986-10-16 Odilo 7000 Stuttgart Schwaiger Pleuelstange fuer hubkolbenmotoren
JPS6365180A (ja) * 1986-09-05 1988-03-23 Matsushita Refrig Co 密閉型電動圧縮機のピストン装置
WO1998019067A1 (fr) * 1996-10-29 1998-05-07 Zanussi Elettromeccanica S.P.A. Piston pourvu d'une bielle liberable pour compresseurs de refrigeration
EP1507088A1 (fr) 2003-08-13 2005-02-16 Nissan Motor Company, Limited Structure pour relier un piston avec un vilebrequin
EP1538373A1 (fr) 2003-12-02 2005-06-08 MAN B&W Diesel AG Mécanisme d'entraínement de moteur à combustion comprenant un piston et une bielle

Also Published As

Publication number Publication date
EP1983232A1 (fr) 2008-10-22
PL2134991T3 (pl) 2013-09-30
EP2134991A1 (fr) 2009-12-23
DE102007018435A1 (de) 2008-10-30
EP2134991B1 (fr) 2013-02-20
ES2419105T3 (es) 2013-08-19
WO2008129391A8 (fr) 2009-12-17

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